The Third Macedonian War was between Rome and King Perseus of
Macedon.
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He was from Macedon.
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Alexander of Philip [Αλέξανδος Φιλίππου] king of Macedon. Later he was granted the title of the Great and of course Alexander III King of Macedon [the third since he was the third Alexander of the house of the Macedon kings]
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Notably , it was Alexander the great , the king of Macedon who
defeated the Persian king Darius the 3rd .